This listing is for a magnetic safety key with a 3cm diameter compatible with the following models:
V-Fit Fit START/ BASIC FOLDING MAGNETIC TREADMILL.
UNO-FITNESS SPEEDMASTER 1.8M & 1.8P TREADMILL
V-FIT FITNESS FOLDING TREADMILL
It is also compatible with other branded treadmills.
All my parts are from originals direct from the manufacturer, Beny Sports.
PM with any questions.